A number of changes in WordPress 6.9 are coming which modernize WordPress’ text encoding and UTF-8 handling. These improvements establish more reliable and consistent text processing across WordPress’ widely-supported environments, benefiting plugins and themes that handle international content, emoji, diacritics, and more.
TL;DR
UTF-8 handling in WordPress no longer depends on the running environment thanks to a new fallback pipeline written in pure PHP. This means that code which works on your development server will work everywhere it’s deployed. Some legacy functions are misleading in their design and are difficult to use properly; these have been deprecated and replaced
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